Pence, Gregory E., author
McGraw-Hill, 2000
Buku Teks
Pence, Gregory E., author
McGraw-Hill, 2000
Buku Teks
Crispin, Frederic Swing, author
Bruce Pub. Co., 1945
Buku Teks
Crispin, Frederic Swing, author
Bruce Pub. Co., 1961
Buku Referensi
edited by Joseph T. Shipley
Writer Publisher, 1979
Buku Referensi